31131243304111 has 4 divisors (see below), whose sum is σ = 31216069580512. Its totient is φ = 31046417027712.

The previous prime is 31131243304099. The next prime is 31131243304199. The reversal of 31131243304111 is 11140334213113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31131243304111 - 2⁹ = 31131243303599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31131243304111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131243301111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42413137650 + ... + 42413138383.

It is an arithmetic number, because the mean of its divisors is an integer number (7804017395128).

Almost surely, 2^{31131243304111} is an apocalyptic number.

31131243304111 is a deficient number, since it is larger than the sum of its proper divisors (84826276401).

31131243304111 is an equidigital number, since it uses as much as digits as its factorization.

31131243304111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84826276400.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 31131243304111 its reverse (11140334213113), we get a palindrome (42271577517224).

The spelling of 31131243304111 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred forty-three million, three hundred four thousand, one hundred eleven".